Add empty_like for NF4Tensor to support offloading #881
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/881
Note: Links to docs will display an error until the docs builds have been completed. ✅ No FailuresAs of commit 04a5b92 with merge base 8236a87 ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
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test/dtypes/test_nf4.py
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| @parametrize("input_size", [(512 * 512,), (512, 512)]) | ||
| def test_empty_like(self, input_size: Union[Tuple[int], int]): | ||
| nf4_tensor = to_nf4(torch.rand(input_size)) | ||
| new_tensor = torch.empty_like(nf4_tensor, device=torch.device("cpu")) |
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nit: to make sure device arg works, can you make sure the nf4_tensor is on gpu?
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jainapurva
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Driss, we can confirm semantics when you're back but I'm fairly confident this is okay
jainapurva
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Driss, we can confirm semantics when you're back but I'm fairly confident this is okay
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* Rename TorchChat to Torchchat * Adding Issue templates
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Ran into issues when trying to offload activations when the activation was an NF4Tensor. (This was found when testing different configs for meta-pytorch/torchtune#1443)
This PR adds
empty_likeand a test case :D The way we implementempty_likeis we traverse through the NF4Tensor's inner tensors and callempty_likeon all of them (quantized_data, quantization_factor, quantization_scalers). This may be semantically sketchy, but since we are creating garbaggio for content anyway that is expected to be overridden later, as long as we preserve the size, this seems fine.